Asthma Topic Guide
Asthma: Asthma is a disease that affects the breathing passages of the lungs (bronchioles). Asthma may be caused by genes and environmental factors. Asthma causes
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Asthma FAQs Our doctors have answers to your frequently asked questions (FAQs) about asthma. Learn what causes asthma, as well as symptoms and treatments for this common breathing disorder.
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